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Convert Varchar to Bit


Convert Varchar to Bit

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yan_aung
yan_aung
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I have a varchar field with true and false contains in them..

Doing this:

Declare @MyValue as bit
set @MyValue = convert(bit, 'True')

Give me the following error message:

Server: Msg 245, Level 16, State 1, Line 2
Syntax error converting the varchar value 'True' to a column of data type bit.

I can do the case statement with when on it like this:
select Deleted = CASE Deleted WHEN 'False' THEN '1' Else '0' END

I want to know why convert function does not work?





JeffB
JeffB
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In SQL, bits are represented by 0 or 1. It doesn't translate the string 'TRUE' to a 1. If the source data is a string 'TRUE', then a case statement has to be used.


Chris Hedgate
Chris Hedgate
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Bits are always 0 and 1. SQL Server does not have a boolean datatype, instead we use bit to represent them. Naturally it is impossible to convert a string to a number, so the convert from varchar to bit fails.

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Chris Hedgate http://www.hedgate.net/
Contributor to the Best of SQL Server Central volumes
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Giles McArdell
Giles McArdell
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Quick and dirty fix:

DECLARE @Word varchar(5)
DECLARE @MyValue as bit
SET @Word = 'True'
select @MyValue = CASE @Word WHEN 'true' THEN 1 ELSE 0 END




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